JPS61115239A - Magnetic disk substrate - Google Patents
Magnetic disk substrateInfo
- Publication number
- JPS61115239A JPS61115239A JP23706084A JP23706084A JPS61115239A JP S61115239 A JPS61115239 A JP S61115239A JP 23706084 A JP23706084 A JP 23706084A JP 23706084 A JP23706084 A JP 23706084A JP S61115239 A JPS61115239 A JP S61115239A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- substrate
- amplitude
- disk substrate
- oscillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気ディスク装置に用いられる磁気ディスク媒
体を構成する磁気ディスク基板の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a magnetic disk substrate constituting a magnetic disk medium used in a magnetic disk device.
近来、磁気ディスク装置においては、磁気ディスク媒体
に対する高密度記録化に伴って磁気ヘッドの浮上高さは
益々微小化される傾向にある。In recent years, in magnetic disk drives, the flying height of a magnetic head has tended to become smaller and smaller as recording density has increased on magnetic disk media.
このため該磁気ディスク媒体の高速回転時の面振れ等を
低減して、磁気ヘッドの低浮上動作を安定化することが
極めて重要な課題となっている。Therefore, it has become an extremely important issue to reduce surface runout and the like during high-speed rotation of the magnetic disk medium and stabilize the low flying operation of the magnetic head.
従来、一般に用いられている磁気ディスク媒体(ハード
ディスク)としては、通常、第3図に示すようにアルミ
ニウム合金等からなる基板1を主体とし、該基板1の各
板面上に磁性材からなる磁気記録媒体層2が塗布法、メ
ッキ法、或いはスパッタリング法等により形成され、更
にその各上面に5i02等からなる保護膜(図示せず)
が被覆された構成を有している。Conventionally, generally used magnetic disk media (hard disks) usually have a substrate 1 made of aluminum alloy or the like as the main body, as shown in FIG. The recording medium layer 2 is formed by a coating method, a plating method, a sputtering method, etc., and a protective film (not shown) made of 5i02 or the like is further formed on each upper surface.
has a covered structure.
しかしながら、上記磁気ディスク基板1がアルミニウム
合金等の金属板であるため、ダンピング定数が小さく、
比較的低い周波数、例えば数百ヘルツ(■z)の振動周
波数による機械的共振が避けられず、その共振点の振幅
が大きいことから、かかる磁気ディスク媒体に対する磁
気ヘッドの安定な低浮上動作が乱されると共に、ヘッド
クラッシュが発生し易いという問題がある。However, since the magnetic disk substrate 1 is a metal plate such as an aluminum alloy, the damping constant is small.
Mechanical resonance due to a vibration frequency of a relatively low frequency, for example, several hundred hertz (■z) is unavoidable, and the amplitude of the resonance point is large, which disturbs the stable low-flying operation of the magnetic head with respect to such magnetic disk media. In addition, there is a problem in that head crashes are likely to occur.
又、近年前記アルミニウム合金等からなる磁気ディスク
基板1に取って替わって、ガラス等からなる磁気ディス
ク基板を用いることも試みられているが、該ガラス製の
磁気ディスク基板は高速回転時の遠心応力に対する強度
が金属外のそれと比較して不安定であり、信頼性が低い
欠点がある。Furthermore, in recent years, attempts have been made to use a magnetic disk substrate made of glass or the like in place of the magnetic disk substrate 1 made of aluminum alloy or the like, but the magnetic disk substrate made of glass is susceptible to centrifugal stress during high-speed rotation. It has the disadvantage that its strength against metals is unstable compared to that of non-metallic materials, and its reliability is low.
本発明は以上のような従来の実情により、金属製の磁気
ディスク基板に対しては、ダンピング定数を増加させて
低撮動周波数による機械的共振の振幅を減少せしめ、又
、ガラス製等の磁気ディスク基板に対しては、前記ダン
ピング効果と回転遠心応力に対する強度の強化を図って
信頼性を向上し、以てこれらの磁気ディスク基板により
磁気ディスク媒体を構成することにより、該各磁気ディ
スク媒体に対する磁気ヘッドの低浮上動作の安定化、長
寿命化を図ろうとするものである。In view of the above-mentioned conventional circumstances, the present invention increases the damping constant for a magnetic disk substrate made of metal to reduce the amplitude of mechanical resonance due to a low imaging frequency. For disk substrates, reliability is improved by strengthening the damping effect and strength against rotational centrifugal stress, and by constructing magnetic disk media using these magnetic disk substrates, This is intended to stabilize the low-flying operation of the magnetic head and extend its life.
上記問題点を解決するために、本発明は磁気記録媒体層
を形成すべき磁気ディスク基板を、アルミニウム合金板
、又はガラス板間に樹脂材を介在してサンドイッチ構造
としたことを特徴とするものである。In order to solve the above problems, the present invention is characterized in that the magnetic disk substrate on which the magnetic recording medium layer is formed has a sandwich structure with a resin material interposed between aluminum alloy plates or glass plates. It is.
即ち、上記のように金属製、或いはガラス製の磁気ディ
スク基板を樹脂材によりサンドイッチ構造とすることに
より、ダンピング効果を高めると共に、回転遠心応力に
対する強度が強化され、これら磁気ディスク媒体に対す
る磁気ヘッドの低浮上動作の安定化と磁気ディスク媒体
の信頼性を向上させることが可能となる。That is, by forming a sandwich structure of a metal or glass magnetic disk substrate with a resin material as described above, not only the damping effect is enhanced but also the strength against rotational centrifugal stress is strengthened. It becomes possible to stabilize the low-flying operation and improve the reliability of the magnetic disk medium.
以下図面を用いて本発明の実施例について詳細に説明す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
第1図は本発明に係る磁気ディスク基板の一実施例構成
を示す概略断面図であって、従来のディスク基板よりも
薄い厚さの2枚のアルミニウム合金板、又はガラス板等
からなる素材円板21.22を、耐収縮性を有するエポ
キシ樹脂系の接着材23で貼り合わせてサンドイッチ構
造とする。24は保護膜(図示せず)が被覆された磁性
材からなる磁気記録媒体層である。FIG. 1 is a schematic cross-sectional view showing the configuration of an embodiment of a magnetic disk substrate according to the present invention, and is made of a material circle made of two aluminum alloy plates, glass plates, etc. thinner than conventional disk substrates. The plates 21 and 22 are bonded together using a shrinkage-resistant epoxy resin adhesive 23 to form a sandwich structure. 24 is a magnetic recording medium layer made of a magnetic material and covered with a protective film (not shown).
このような基板構成とすることにより、該磁気ディスク
基板のダンピング定数が増加し、第2図の振動周波数特
性(コンプライアンス、振動変位X/力F)図によって
明らかなように、高速回転時の面振れ、即ちディスク面
の振動の共振点における振幅が、実線Aで示す従来の共
振点における振幅に対して、鎖線Bで示すように数分の
−に極めて効果的に低減され、磁気ヘッドの低浮上動作
の安定化を図ることが可能となる。By adopting such a substrate configuration, the damping constant of the magnetic disk substrate increases, and as is clear from the vibration frequency characteristics (compliance, vibration displacement X/force F) diagram in FIG. The amplitude of runout, that is, the vibration of the disk surface at the resonance point, is extremely effectively reduced by a few minutes, as shown by the chain line B, compared to the conventional amplitude at the resonance point, shown by the solid line A. It becomes possible to stabilize the floating operation.
又、特にガラス板からなる素材板21.22をエポキシ
樹脂系接着材23で貼り合わたサンドイッチ構造の磁気
ディスク基板においては、ダンピング定数が増加するこ
とは勿論のこと、柔軟性、クランク防止等の機械的強度
が向上し、高速回転時の遠心応力に対する脆性破壊等が
効果的に抑制される。In particular, in a magnetic disk substrate having a sandwich structure in which material plates 21 and 22 made of glass plates are bonded together with an epoxy resin adhesive 23, not only the damping constant increases, but also flexibility, crank prevention, etc. Mechanical strength is improved, and brittle fractures caused by centrifugal stress during high-speed rotation are effectively suppressed.
尚、以上の実施例では2枚の素材円板をエポキシ樹脂系
接着材を介してサントイ・ノ゛チ構造とした場合の例に
ついて説明したが、本発明はこの例に限定されるもので
はなく、必要に応じて3枚、4枚と複数枚の素材円板を
耐収縮性及び撮動に対する高減衰性を有する樹脂接着材
等を介してサンドイッチ構造としても良く、同様の効果
が得られる。In addition, in the above embodiment, an example was explained in which two material disks were made into a Santoy-Nochi structure via an epoxy resin adhesive, but the present invention is not limited to this example. If necessary, a plurality of material disks, such as three or four, may be sandwiched together using a resin adhesive having shrinkage resistance and high attenuation for imaging, and the same effect can be obtained.
以上の説明から明らかなように、本発明に係る磁気ディ
スク基板によれば、高速回転時のディスク面振れの振幅
を大きく減少することが可能となり、磁気ヘッドの低浮
上動作を安定化することができる。As is clear from the above description, according to the magnetic disk substrate according to the present invention, it is possible to greatly reduce the amplitude of disk surface runout during high-speed rotation, and it is possible to stabilize the low-flying operation of the magnetic head. can.
更に、ガラス製ディスク基板では特に機械的強度が増加
する等、信頼性の良い磁気ディスク基板を提供すること
ができる。よってこの種の磁気ディスク媒体に通用して
極めて有益、かつ効果的である。Furthermore, a magnetic disk substrate made of glass can provide a highly reliable magnetic disk substrate, especially since its mechanical strength is increased. Therefore, it is extremely useful and effective for this type of magnetic disk medium.
【図面の簡単な説明】
第1図は本発明に係る磁気ディスク基板の一実施例構成
を示す概略断面図、
第2図は磁気ディスク基板の振動周波数特性を説明する
ため図、
第3図は従来の磁気ディスク基板の一実施例構成を示す
概略断面図である。
図中、21.22は素材円板、23はエポキシ樹脂系接
着材をそれぞれ示す。[Brief Description of the Drawings] Fig. 1 is a schematic sectional view showing the structure of an embodiment of the magnetic disk substrate according to the present invention, Fig. 2 is a diagram for explaining the vibration frequency characteristics of the magnetic disk substrate, and Fig. 3 is a diagram for explaining the vibration frequency characteristics of the magnetic disk substrate. 1 is a schematic cross-sectional view showing the configuration of an example of a conventional magnetic disk substrate. In the figure, reference numerals 21 and 22 indicate a material disk, and 23 indicates an epoxy resin adhesive, respectively.
Claims (1)
、アルミニウム合金板、又はガラス板間に樹脂材を介在
してサンドイッチ構造としたことを特徴とする磁気ディ
スク基板。1. A magnetic disk substrate on which a magnetic recording medium layer is to be formed, characterized in that it has a sandwich structure with a resin material interposed between aluminum alloy plates or glass plates.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23706084A JPS61115239A (en) | 1984-11-09 | 1984-11-09 | Magnetic disk substrate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23706084A JPS61115239A (en) | 1984-11-09 | 1984-11-09 | Magnetic disk substrate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61115239A true JPS61115239A (en) | 1986-06-02 |
Family
ID=17009821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23706084A Pending JPS61115239A (en) | 1984-11-09 | 1984-11-09 | Magnetic disk substrate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61115239A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5119259A (en) * | 1989-12-06 | 1992-06-02 | Fuji Photo Film Co., Ltd. | Magnetic disk |
US6055140A (en) * | 1997-07-25 | 2000-04-25 | Seagate Technology, Inc. | Rigid disc plastic substrate with high stiffness insert |
-
1984
- 1984-11-09 JP JP23706084A patent/JPS61115239A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5119259A (en) * | 1989-12-06 | 1992-06-02 | Fuji Photo Film Co., Ltd. | Magnetic disk |
US6055140A (en) * | 1997-07-25 | 2000-04-25 | Seagate Technology, Inc. | Rigid disc plastic substrate with high stiffness insert |
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